Windows Phone 7.1 app keeps crashing about reactiveui HOT 2 CLOSED

using System;
namespace MyForum.Models
{
public class PivotInfoItem//:INotifyPropertyChanged
{
private String _title;
public string Title
{
get
{
return _title;
}
set
{
//if (_title != value)
//{
_title = value;
// OnPropertyChanged("Title");
//}
}
}

}

}

from reactiveui.

I got it thanks... I was missing some references.

from reactiveui.